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中央断裂带位于中国东部东营凹陷中部 ,发育有厚达 70 0 0 m的第三系碎屑岩。主要勘探目的层是第三系的沙河街组地层。影响中央断裂带的主要地质力学因素有三个方面 :(1 )脊部塌陷机制 :由东营凹陷北部的埕南大断裂 (犁式张性断裂 )所控制的凹陷中部地堑型断裂 ;(2 )塑性物质上隆机制 :中央断裂带深部存在盐体上隆 ;(3)右旋张扭机制。这些机制在时间上不是孤立的 ,而是相互作用的。区域构造、沉积作用和右旋张扭应力控制了脊部塌陷 ,而右旋张扭又与塑性盐体上隆产生的拉张有关。因此 ,中央断裂带的形成是这三种机制在时间上和空间上复合叠加作用的结果。该文对中央断裂带西部的现河庄油田的地震剖面进行了综合解释 ,研究了断裂体系的动力学特征和构造演化模型 ,认为中央断裂带的形成演化经历了四个演化阶段 :初期凹陷阶段、早期拱张阶段、中期断陷阶段和晚期稳定阶段。根据中央断裂带的地质、沉积、构造模型和演化的综合研究 ,探讨了断裂带的生、储、盖组合等油气体系 ,指出了油气勘探的重要领域为高断块、岩性圈闭以及与深部盐体有关的油气藏
The central fault zone is located in the central part of the Dongying Sag in eastern China and developed Tertiary clastic rocks with a thickness of 70,000 m. The main exploration target is the Tertiary Shahejie formation. The main geomechanical factors that affect the central fault zone are as follows: (1) Ridge collapse mechanism: the central depression graben controlled by the Junan Grand fault (plow-type tension fracture) in the northern part of Dongying depression; (2) Material uplift mechanism: There is a salt body uplift in the deep part of the central fault zone; (3) Dextral torsion mechanism. These mechanisms are not isolated in time, but interact. The regional tectonics, sedimentation and dextral tensile-torsional stress control the ridge collapse, while the dextral torsion is related to the extension of the plastic salt body. Therefore, the formation of the central fault zone is the result of complex superimposition of these three mechanisms in space and time. In this paper, the seismic profile of the Xianhezhuang Oilfield in the west of the central fault zone is comprehensively explained. The dynamic characteristics and tectonic evolution model of the fault system are studied. The formation and evolution of the central fault zone have undergone four stages of evolution: the initial depression stage , Early arching stage, mid-stage fault depression stage and late stable stage. Based on the comprehensive study of the geology, sedimentation, tectonic model and evolution of the central fault zone, the oil and gas systems of the fault zone are discussed, such as the combination of the reservoirs and cap rocks. It is pointed out that the important areas of oil and gas exploration are high fault blocks, lithologic traps, Deep salt-related reservoirs